Amazingfacts

Jupiter has no surface for a spacecraft to land on because it is made mostly from helium gas and hydrogen. The massive pull of Jupiter’s gravity squeezes the hydrogen so hard that it is liquid.

This hypothetical cosmic body acts in the exact opposite manner of a black hole. Instead of pulling in matter, a white hole expels it like a sort of cosmic exhaust valve, giving off serious amounts of energy. Some cosmologists theorize that a black hole in one universe might empty out through a white hole in another universe. In these theories, the black hole acts as a kind of tunnel -- instead of pulling in matter that collapses into a single point, the black hole shuttles the matter right through the tunnel and out the white hole on the other end . In other words, the matter that comes out of a white hole is the matter that fell into a black hole.